Text-book of comparative anatomy . On the segments of the °J. Abdomen ; 1-5, limbs of the head;/ II,i r • °f the thorax. In all subsequent figures the abdomen also formations appear which are head limbs are denoted by Arabic, the thoracicprobably the rudiments of the pleopoda limbs by Roman numerals, the abdominal limbs(cti-a6). In any case the beginnings of the (ple^poda) by aj, a2 etc., tin- t..-lsmi by t, thelast pair of pleopoda which are destined to e3H>P°dite b> ex> and the endopodite by <form with the telson the caudal fin, are distinctly visible on each side as bi-lobedform
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Text-book of comparative anatomy . On the segments of the °J. Abdomen ; 1-5, limbs of the head;/ II, i r • °f the thorax. In all subsequent figures the abdomen also formations appear which are head limbs are denoted by Arabic, the thoracicprobably the rudiments of the pleopoda limbs by Roman numerals, the abdominal limbs(cti-a6). In any case the beginnings of the (ple^poda) by aj, a2 etc., tin- t..-lsmi by t, thelast pair of pleopoda which are destined to e3H>P°dite b> ex> and the endopodite by <form with the telson the caudal fin, are distinctly visible on each side as bi-lobedformations under the integument. 6. Second Zoaea Stage (Fig. 264, 0).— The last pair of pleopoda project fiv.-!y.On the two pairs of maxillre the small fan-plates (exopodites) have formed. The 5. -an 392 COMPARATIVE ANATOMY CHAP. posterior pairs of thoracic feet (ambulatory feet) project freely as doubly-tipped pro-tuberances. The formations on the abdomen of the 1st Zocea stage, which wereindicated as the rudiments of pleopoda, are no longer to be seen. The cephalothoracicshield has a pointed process projecting anteriorly in the middle line. The animal stillmoves chiefly by means of the 2 pairs of antennse. 7. Mysis or Schizopoda Stage (Fig. 264, I)}.— This is so called because all thethoracic feet are developed, like those of the Schizopoda, as long biramose limbs(with exo- and endopodite), and here also serve for swimming. The branchial appen-